Automatic valve.



E W. D SCHEH AUW-FUIC VALVE.

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EDWARD WILLIAM DISCHER, OF SEATTLE, WASHINGTON.

AUTOMATIC VALVE.

Specicntion of Letters Patent.

Patented Dec. 10, 1918.

*Application led December 17, 1917. Serial No. 207,475.

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it known that I, EDWARD VILLIAM Discman, a citizen of the United States,and residentof Seattle. in the county of King' and State of Washington.(whose post-office address is Stanley Apts.,) have invented a new anduseful improvementin Automatic Valves, of which the following is a fulland exact specification.

This invention relates to improvements in automatic valves and is in thenature of an .improvement on the valve disclosed in my co-pendino'application Serial Number interi. and pru 7, 1917, raient 1,257,070,Feb. i9, 191s.

The objects of the invention are to improve and render more reliable andefficientvalves of this nature that are adapted to be connected with thefuel and air supply pipes of an oil burner and operated by variations inthe pressure` of air within the air pipe to shut oi the flow of oil whenthe air preesure within the air pipe is reduced below a predeterminedminimum.

The features of this valve that constitute the improvement over theAvalve disclosed in my prior application are; the means' for adjustingthe compression of the valve closing spring; the vent for admitting airto the springchamber; the stops or seats for the air piston; the threepart structureof the valve casing which facilitates assembling andenables the oil valve to be ground into its seat if it becomes worn sothat it leaks oil and the means of adjustment between the oil valve andair iston.

ln the type of oil burners commonly used in connection with furnaces theoilis sprayed into the combustion chamber of the furnace by means of airunder pressure and the flame from the burner will go out or beextinguished if the pressure of theyair drops below a certainminimumusually about three pounds. This air pressure is generallymaintained by an air compressor` which must run constantly' in order toinsure a steady flame.

If the air compiessor should be stopped owing to an accident during theabsence of an attendant and the air pressure drop below the minimumnecessary toimaintain the flame, such flame will be extinguished but theoil will continue to feed and Will run out into the hot lire box, andthere be gasitied. and perhaps produce an explosion that will start adestructive liree or wreck the furnace in the basement of a building.

This valve is so designed that when the air pressure falls below acertain predetermined minimum the oil or fuel feed will be automaticallyshut olf.l

The invention-consists in the novel construction, adaptation andcombination of parts of an automatic valve as will be more clearlyhereinafter described and claimed.

` In the accompanying drawings Figure l is a view in longitudinalsection of a valve constructed in accordance with this inven-V tion asit may appear when closed and Fig. 2 is a similar view showing the valvein an open position and showingcertain portions in elevation and certainother portions broken away.

Referring to the drawings throughout which Alike reference numeralsdesignate like parts the numerals 5, (5 and 7 designate the threeparts-.of a valve casing, respectively.

The parts 5 and 6 are secured together by a union 8 and the part 7 isscrewed into the end of the part 6 as indicated at 9.

The part 5 is provided with an axial chamber l() and with acoucentrically arranged seat ll for the reception of a valve l2 that isscrewed onto the end of a valve stem13.

.The 'part 5 is also provided with an axially alined oil outlet 1i andan oil inlet 15 that is disposed at right angles to the valve casing andcommunicates with the chamber 16) to the rear of the valve seat 11.-

4 The section G is provided with a cylindrical bore 1G that is enlargednear the outer end thereof to form a shoulder 17 and provide a chamber18 in which a cylindrical valve or air piston 20 may work.

The piston 2O is screwed onto the end of the valve stem 13 and is heldin adjusted positionwith respect to the valve 12 by a Alock nut 21.

The side of the piston 20 opposite the valve -stem 13 is provided withan integral shank 22 upon the outer end of which is formed a piston 23that is movable Within a cylindrical chamber 24 in the casing section 7.l

The diameter the chamber 24 is abruptly reduced as at 25 to form ashouldei` that may serve as a stop for the piston 23 when the valve isopen and silch chamber communicates with a spring chamber 26 withinwhich is disposed a spring 27 that bears against'the piston '23.

The outer end of the spring chamber 26 is closed by a plug 28 thatscrews thereinto and the outer end of the sprino' 2T is supported by adisk 30 that is rotatably monnted on the end of a tap screw 31 thatscrews through the plug 28 whereby the disk 30 may be moved lengthwisewithin the spring chamber 26 by turning the screw to thereby I vary thepressure ot' the spring' 27.

The tap screwl is providedjvith an axially disposed vent opening 320ismall diameter to relieve any air pressure within the chambers 2-'1 and26 and prevent a partial vacuum from being formed therein and operatingagainst the force of the spring 27 to prevent the closing ot' the valvewhen the air pressure is rednced. A

The chamber 1G is provided with an air inlet 33 arranged at right anglesthereto and the chan'iber 18 is provided with an air outlet 34 arrangedat right angles thereto and offset with respect to the inlet The valvestem 13 is movable through a. packing gland 35 in apartition wall 36that of disk like construction and interposed in suitable recessesbetween the abutting ends of the casing parts 5 and 6.

Then the disk 36 is inserted and the union S is tightened a leak proofpartition is formed that precludes the pass.r ge of air or oil betweenthe chambers 10 and 16.

The pistons 20 and 23 are preferably recessed as at 37 so that theywillnot bear against their respective. cylinder walls for so great adistance and thereby will offer less resistance-to'movcment.

The valve 12 is preferably of smaller diameter than the chamber 10 sothat oil may flow around theedges thereof when snch valve is'withdrawnpast the oil inlet 15 as shown -in Fig. 2 and so that the pressure ofthe oil will be the same on both sides of the valve 12 when the latterlis in any except the fully' closed position. When the valve 12 isentirely closed any pressure. of oil within the chamber 10 will tend toclose. such valve more tightly.

The valve 12 may be provided in its front en d with a suitable slot 3Sfor the reception of a screwdriver that may be used in turning the valveonto or ol' of the stem. 13.`

iVhen the air is shut ott' the several parts of the valve will occupythe positions shown in Fig. 1" but when air under pressureslifficient toovercome the compression of the spring is admitted through -th-'e airinlet .33 the piston valve 2() willbe' moved to the right Vinto aposition as shown in Fig. 2 thereby opening a passageway between the airinlet 33 and air outlet 84 and also moving the valve' 12 to the rightandvopeningr a passagenav between the oil inlet 15 and oil outlet 1+.

"hen the air pressure Jalls below a predetermined lninimum. the force ofthe spring 2T will be sutlicient to move the valve parts bark into'tlieposition shown in Fig. 1 and close the oil passageway.

The union S permits the member 5 to be secured to the member in anyrelative angular position after the connections with the several inletand outlet pipes have been made and also permits these two parts to bereadily taken apart. thereby overcoming difliculties that would beencountered in positioning the oil inlet pipe 15 and air inlet pipe 33it these two parts were screwed to- \gether like the parts (S and 7.

\1 Screwing the valve 12 onto the. stem 13 enables the operator toremove the casing part 5 and' valve 12 and ,then unscrew the casingsection 7 and remove the pistons 20 and 23 and valve stem 13 for thepurpose ot' tighteningr the lock nut 21 after the proper adjustmentbetween the valve 12 and piston 20 has been made. l' y If the valve 12becomes worn so that it leaks oil the casing section 7 may be removedand the valve 12 ground into the seat 11 by placing a screw driver orsimilar instrument fin a groove 40 in the end ot' the piston 23 andturning the valves.

This adjustment of the piston 20 with respeet to the valve 12 isnecessary because of the necessity of the valve 12 firmly seating on theseat 11 at the same time that the piston 20 engagesthe shoulder 17.

l/Vhen the valve pistons 20 and 2? are moved to the right as far aspossible they will engage with the end ot the member 7 and the shoulder25 respectively and will ei'ectively prevent the passage of any air intothe spring chamber.

The vent opening 32 prevents an air pres- It is obvious that changes inthe form of construction of the various parts of this device mayzberesorted to within the scope of the following claims.

What I claim and desire to y' Letters Patent, is-

` 1. Al valve of the class described comprising a casing having aninternal recess divided into two cylindrical compartments by a partition.-wall, a valve stem slidable through said partition wall, a valvepiston 'protect .by

secured on each end of said valve stem, fuel inlet and outlet pipesconnected with one of said compartments, air inlet and outlet pipesconnected `with the other of said ('.onipartments at points offset withrespect to each 'open position liv other. a spring to normally closesaid valve passage of fuel when ihe air pressure is low, and means foradjusting the pressure of lsaid spring, said valve pistons being adaptedto be moved into an the pressure of said air when said 'pressure reachesa certain predetermined amount.

2. A valve of the class described comprising a casingrr having aninternal recess divided into tivo compartments b v a partition wall` avalve teni slidable through said partition` a valve secured to one endof said valve stein. a piston secured to the opposite end ot' said valvestein, means for adjusting the distance between said valve` a valveseatl for said valve. a shoulder against which said piston engages whensaid valve is on lsaid seat, fuel inlet and outletl of saidcoinpartpipes connected with one ments. air inlet and outlet. pipesconnected with the other of said eoiiipartinents at points otl'set` withrespect to each other, an adj ustably supported spring to normally closesaid valve and prevent the passage of fuel when the air pressure is low,saidvalve beineadapted to be moved into an open position by the pressureof air on said piston when the pressure reaches a predetermined 3. Avalve ot' the class described comprising a three part valveeasingliavigaxially arranged valve chambers in eat-h of said parts'. aunion connecting two of said casing pa`i"ts. a disk interposed .betweensaid two parts to form a partition wall, said disk liaving a packinggland arranged centrally piston and said.

thereof, a valve stem slidable through said partition wall, a valveremovably secured on one end of said stein, avalve seat for said valve,fuel inlet and outlet means controlled y said valve, a piston adjustably secured on the other end of said valve stem, a shoulder withwhich said piston may be adjusted to engage when said valve is closed, aspring to normallyhold said piston and said valve in a. closcd position,and air inlet and outlet means connected with said valve casing atpoints ott'set with respect to each other to move said piston and opensaid valve in Iesponse to the admission of air under pressure. 4. Avalve of the class described comprising a casing, divided into twocompartments b v ai partition wall, a valve stein slidahle through saidpartition wall, 'a valve remov ably secured to one end of said stem, avalve seati'for said valve, oil inlet and outlet means 'said lrst namedpiston, a' helical compies- EDWARD WILLIAM DISCHER.

